Examine source code of Dark Front

{
  "name": "Dark front",
  "manifest_version": 2,
  "version": "1.84",
  "theme": {
    "colors": {
      "frame": "#bfbfbf",
      "button_background_active": "#3874b1",
      "tab_background_text": "rgba(69, 69, 69, 1)",
      "tab_background_separator": "rgba(0, 0, 0, .75)",
      "tab_text": "rgba(255, 255, 255, 1)",
      "tab_line": "#5d8fc3",
      "tab_loading": "#184674",
      "tab_selected": "#3874b1",
      "icons_attention": "#6a98c7",
      "bookmark_text": "#fff",
      "toolbar": "rgba(71, 71, 71, 1)",
      "toolbar_field": "rgba(38, 38, 38, 1)",
      "toolbar_field_text": "rgba(230, 230, 230, 1)",
      "toolbar_field_border_focus": "#3874b1",
      "toolbar_field_separator": "rgba(71, 71, 71, 1)",
      "toolbar_highlight": "#3874b1",
      "toolbar_highlight_text": "#fff",
      "toolbar_top_separator": "rgba(71, 71, 71, .5)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, .75)",
      "ntp_text": "rgba(230, 230, 230, 1)",
      "ntp_background": "#2f2f32",
      "popup": "rgba(52, 52, 52, 1)",
      "popup_text": "rgba(230, 230, 230, 1)",
      "popup_border": "rgba(62, 62, 62, 1)",
      "popup_highlight": "#3874b1",
      "popup_highlight_text": "#fff",
      "sidebar": "rgba(71, 71, 71, 1)",
      "sidebar_text": "rgba(230, 230, 230, 1)",
      "sidebar_highlight": "#3874b1",
      "sidebar_highlight_text": "#fff"
    }
  }
}